Negative volume Detected in Dynamic Mesh after 1500 time steps

abhinavgupta88 · September 14, 2012, 14:23

I am running a simulation of a 2D Piston. The geometry is an enclosed 2D rectangle, in which two sides are the piston. I am using Fluent. The motion of the pistons are specified by UDF. I am using dynamic mesh. The size of the time step is 2E-6 and the Cell height I am using is 8E-5. My case ran fine for 1500 time steps but it gave me an error of Negative Volume. I appreciate if anyone can help

cdegroot · September 16, 2012, 09:31

Try the fluent forum. You are more likely to find a fluent expert there.

shuai_manlou · September 17, 2012, 20:55

How do you use you dynamic mesh, which method is applied for its motion, layering, smoothing or local re-meshing ? Maybe different results can be obtained ~

September 14, 2012, 14:23	Negative volume Detected in Dynamic Mesh after 1500 time steps	#1
abhinavgupta88 New Member Abhinav Join Date: Mar 2011 Posts: 17 Rep Power: 15	I am running a simulation of a 2D Piston. The geometry is an enclosed 2D rectangle, in which two sides are the piston. I am using Fluent. The motion of the pistons are specified by UDF. I am using dynamic mesh. The size of the time step is 2E-6 and the Cell height I am using is 8E-5. My case ran fine for 1500 time steps but it gave me an error of Negative Volume. I appreciate if anyone can help

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September 16, 2012, 09:31		#2
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 17	Try the fluent forum. You are more likely to find a fluent expert there.

September 17, 2012, 20:55		#3
shuai_manlou Member CAO Liushuai Join Date: Apr 2012 Posts: 30 Rep Power: 14	How do you use you dynamic mesh, which method is applied for its motion, layering, smoothing or local re-meshing ? Maybe different results can be obtained ~